The majority of the spectra we used were obtained during a four-year campaign with the ARCES spectrograph [1]} mounted on the 3.5 m telescope at Apache Point Observatory (APO). We also used one other instrument, SOPHIE [2]} at the 1.93 m telescope at the Haute-Provence Observatory (OHP). We used spectra from both instruments to compute the radial velocities, but only kept those obtained with ARCES to derive the atmospheric parameters.
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